I have my own little system that works well for me. A lot of people will use baseball card holders in binders, etc. etc. Much too much work for me. I put all my coupons in sandwich bag-sized ziplocs labeled with a permanent marker by category. For example, some of the categories I have:
-Hair products
-Refrigerated items
- Frozen items
- Makeup
- Lotions/body washes/etc.
- Feminine products
- Razors
- Deodorants
- Canned goods
- Cereals/Pop Tarts, etc.
- Drinks
- Miscellaneous (batteries, dog treats, etc.)
Then all the little ziplocs just get thrown into a Big Ziploc bag. It's easy to grab, is very light, doesn't take up much space, and is easy to just keep in the front of the cart.
They key to couponing is doing whatever works for you so that you actually use the coupons you have effectively and don't miss the bargains for that coupon you actually have in your pile, kwim?
Good luck coming up with a system.